Affiliation: | 1. Department of Medicine, Division of Infectious Diseases, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive – MSC 7881, San Antonio, TX 78229-3900, USA;2. Department of Internal Medicine, Division of Infectious Diseases, University of California – Davis Health;3. Department of Medical Microbiology and Immunology, University of California – Davis Health |